Cook the noodles in a large saucepan of unsalted water for 4 minutes or according to the instructions on the packet.
Meanwhile, heat a large wok over a high heat until smoking. Add the oils and stir-fry the peppers for 1–2 minutes. Add the mushrooms, cook for 1 minute, then add the carrot and cook for a further minute. Add the spring onions, chilli and prawns and stir-fry for 2 minutes.
Drain the noodles and add them to the wok. Mix to combine, heat through, then scatter with the sesame seeds and serve immediately.